Work at taking in a drama (4)
I believe the answer is:
play
'drama' is the definition.
('play' can be a synonym of 'drama')
'work at taking in a' is the wordplay.
'work at' becomes 'ply' (I've seen this before).
'taking in' is an insertion indicator.
'ply' going around 'a' is 'PLAY'.
(Other definitions for play that I've seen before include "Perform music" , "Dramatic work" , "Uncle's premises" , "Participate in games or sport" , "Frolic" .)